You need to look at all factors:
- Max network throughput
- Bus speed of target drive
- Target drive write speed
- SSH overhead
Use iperf3
to verify throughput.
USB 2.0 max. is about 40 MB/s. How is the drive connected?
What is the brand/model of the drive?
NFS, for example, will likely be faster than SSH.
You’ll need to answer those questions and dig up the specs.